英语词汇alertness怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	alertness
释义	alertness /əˈlɜːtnɪs/ n. (liveliness of mind)警觉；警惕；留神；注意 The drug improved mental alertness.这种药可以提高大脑的注意力。
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